Parapet Thrasher is a rare Creature — Dragon card from Tarkir: Dragonstorm Commander (TDC), collector number 76. Current market price: $3.29, TCGplayer market prices via Scryfall.
Flying Whenever one or more Dragons you control deal combat damage to an opponent, choose one that hasn't been chosen this turn — • Destroy target artifact that opponent controls. • This creature deals 4 damage to each other opponent. • Exile the top card of your library. You may play it this turn.